Preferred and Common Stock - Details For the Share Repurchases (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
August/September 2020 open market repurchase
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	2,907,094
Average Price (in usd per share) | $ / shares	$ 17.36
Total | $	$ 51
November 2020 open market repurchase
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	937,831
Average Price (in usd per share) | $ / shares	$ 23.99
Total | $	$ 22
2020 Share repurchase total
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	3,844,925
Average Price (in usd per share) | $ / shares	$ 18.98
Total | $	$ 73
February 2019 ASR total
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	36,434,423
Average Price (in usd per share) | $ / shares	$ 19.21
Total | $	$ 700
May 2019 ASR total
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	9,016,981
Average Price (in usd per share) | $ / shares	$ 22.18
Total | $	$ 200
August 2019 ASR total
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	7,774,279
Average Price (in usd per share) | $ / shares	$ 25.73
Total | $	$ 200
November 2019 open market repurchase
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	1,626,681
Average Price (in usd per share) | $ / shares	$ 30.74
Total | $	$ 50
2019 Share repurchase total
Accelerated Share Repurchases [Line Items]
Number of shares (in shares) | shares	54,852,364
Average Price (in usd per share) | $ / shares	$ 20.97
Total | $	$ 1,150